Power tool grinder



A. M. MCLERAN. POWER TOOL GRINDER.

APPLICATloN FILED FEB. 9, 1920.

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PGNER TOOL GRINDER.

Application fled February 9, 1920. Serial No. 357,255.

Be it known that l, ALvoizn lli/l. Moleirmn, a citizen of the llnited ltatesl residing at Chicago, @ook County, illinois, have invented certain new and useful improvements in llower Tool Grinders, of which the folhre-fing. tali/n in connection with 'the drawings, 'is a description.`

lily invention relates to grinding toolsof the class employed in machine shops and other places where sharp edged tools are used. and is so constructed'and arranged that it may he driven from any suitable line shaft to which a pulley can be attached.

A further object of my invention is to provide means easily and quickly adjustable whereby the direction of rotation of the grinding wheel' may be reversed to accommodate different tools to be operated upon.

lt is also an object of my inventionto arrange in proximity to the grinding wheel, means for adjusting thev tool to be ground and at thevproper lined angle to the wheel grind the proper bevel on the edge sha period.

These and other features of the machine he apparent to those skilled :in the rart which my invention relates:-

n the accompanying drawings l have illustrated what l now consider the preferred forni of the essential elen ents to be embocicd in my invention, and in these drawings:-

l'7 l. is a side elevation, partly in section of an embodiment of my invention and:

ITPio. 2 is an end elevation of the machine.

Referring to the drawings il. represents a suitable base from which rises a bearing member A which in turn supports the bearing' oehs il and el'. 5 is a shaft which is i "ed in bloclrs 3 and 4 and which. s A ports the oveble partsvof my machine. Mounted upon one end of the shaft 5 which entends through the bearing 3 is a Varborundum or emery wheel 6. 'l' and 8 are pulleys me nted upon the shaft 5 preferalilj,7 between the bloelrs and Li, each of which pulleys supports a belt 9 which is connected with e suitable source of power.

A vertically extending stub shaft l rises from the' base il. and supports upon the upper end thereof a sheave l1 over which the belt 9 passes, in traveling from one to the other of the pulleys 7 and 8.

Projecting from one face of each of the pulleys Z and 8 is a clutch engaging member 12-13, which is adapted to be engagedby end 19 being engaged by the screw 20 which projects into a socket 2l formedl in the bearing block Li.

liiounted upon the shaft are the collars 22-23, one of. which abuts against the inner Aface of each of the pulleys 7 and 8.

24 isa clutch ring surrounding the shaft 5 between the pulleys 7 and 8, and which carries upon opposite faces thereof the ribs or projections 25, which are adapted to engage alternately with corresponding ribs or projections )l2-13 on the inner face of the pulley 7 and 8.

its the parts are assembled between the bearing blocks 3 4; an annular recess a is provided between the rings 22-03 and eX- vtending through the ring 2li in the direction of its diameter', and through the rod l5, is a pin Q6. By this means, the clutch ring 24.- and the rod l5 are at all times lixedly secured together and may be adjusted in a longitudinal direction bringing the engaging clutch members upon either side of the ring 2d into engagement with a corresponding member on the pulley 7 or 8 as desired depending upon the direction in which the wheel 6 is to be revolved.

llhen the clutch ring is to he brought into Contact with the pulley 7, the adjusting screw is partially withdrawn from the soelret 2l, which through the lever l? presses against the rod l5 forcing it into the bore let until the clutch member is brought into engagement with the correspending member l2 and a reverse action is necessary to move theJ clutch ring 24. in the opposite direction and bring the clutch member 25 into engagement with the corresponding clutch member 13 upon the pulley 8.

Adjustably mounted in bearing member 8 are the rods QTL-28, extending into operative relation with the wheel 6 upon opposite sides of the peripheral face thereof.y Sup ported upon each of these rods is a guide -30 which in turn is movably attached by the thumb screws 31-32 to a support BSWSLI, which is adjustably fixed to the rod 27-28 by means of the set screws 353-36.

By reason of these different adjustments the faces of the guide members .2Q-30, may be adjusted with respect to the incline toward the periphery of the emery wheel, so that. any tool required to be sharpened may be held upon the guide plate or between it and the periphery of the wheel in the proper position to secure the desired bevel or angle.

In the construction here shown I have illustrated a power driven grinding mechanism but contemplate the use of the guide members 29-3O attached to al hand operated wheel as well,las it will be observed theyl are in no way connected with the driving mechanism.

I claim: 1

1. In a tool grinder, the combination of a grinding wheel mounted upon a rotatable shaft, tools mounted on said shaft, clutch engaging members formed on opposite faces of saidtools, a clutch member mounted on said shaft between said tools, means for actuating said clutch to engage eithery of said tools, rods extending` into operative relation with the aforesaid grinding wheel upon opposite sides of the peripheral face of said wheel, a guide member supported uponl each of the rods and adjustable toward and from the face of the grinding wheel, and means for. locking said guide members in different positions with respect to the face of the grinding wheel.

2. In a tool grinder, the combination of members in different angular positions y with respect to the peripheral face of said Wheel.

3. In a tool grinder, the combination of a grinding wheel mounted upon a rotatable shaft, tools mounted on said shaft, clutch engaging members formed on opposite faces of said tools, a clutch member mounted on said shaft between said tools, means for actuating said clutch to engage either of said toolsLg-uide supporting rods adjustably mounted 1n bearings in proximity to theA aforesaid grinding wheel, guide members movably mounted on said rods and means for locking them 1n different adjusted positions toward and from the peripheral face of said wheel,l the positions of said guide members movable to different angles withv respect to the peripheral face ofthe grinding wheel, and means for locking said guide members in dierent .fixed positions, sub stantially as described.

In testimony whereof-I have'signed thisv specification.

ALVORD M. MCLERAN. 

